schuchert - vm.compiling.phantomjs2.ubuntu

These notes come from two sources:

The steps are repeated here because the order is different from the base instructions:

I'm using a VM, so make sure you have plenty of RAM. 4gm was inconsistent, so I bumped mine up to 7 just in case.
Install needed build dependencies
```
sudo apt-get install build-essential g++ flex bison gperf ruby perl \
  libsqlite3-dev libfontconfig1-dev libicu-dev libfreetype6 libssl-dev \
  libpng-dev libjpeg-dev python libx11-dev libxext-dev
```
Clone the repo and move to the 2.0 branch
```
git clone git://github.com/ariya/phantomjs.git
cd phantomjs
git checkout 2.0
```
Apply the changes from Patch with forward declares. If you trust me, here's a patch you can directly apply:
0001-Added-forward-defs-to-get-code-to-compile.patch
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.
Build phantomjs2 (this should detect the number of cores and parallelize the build, if not you can add --jobs 4, for example)
```
./build.sh --confirm
```
If this fails, you might need to up your memory and make sure you are not doing anything else.
If you get an error related to a problem with a .o or some object missing from a library, up your memory as well. And then do this to restart the whole build
```
git clean -fdx
./build.sh --qt-config "-I /usr/local/include/ -L /usr/local/lib/" --confirm
```
I had a lot of failures and it is probably related to running out of memory. If you are doing nothing else, 4 gb is probably enough. I was using IntelliJ and running a command line build and once I hit 53 free megabytes out of 7 gb and realized that was probably why it was failing.
This creates bin/phantomjs. You can move the executable anywhere, it does depend on shared libraries on your system.
Full-disclosure, building this on my VM has caused it to hang. I kill it and restart the build. But if you are using VirtualBox, it might be unstable.